Cryptology ePrint Archive: BibTeX Citation of Report 2009/194

@misc{cryptoeprint:2009:194,
    author = {Mingwu Zhang and Yusheng Zhong and Pengcheng Li and Bo Yang},
    title = {Analysis and Enhance of Anonymous Signcryption Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2009/194},
    year = {2009},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.